Distribution,migration and purifying effect of cadmium in artificial Avicennia marina wetland system

Abstract

Abstract: An artificial mangrove Avicennia marina wetland was set up in a greenhouse,and an irrigation experiment with synthetic wastewater was performed to research the behavior of cadmium in the artificial wetland system.The synthetic wastewater C₁ had the characteristics and strength similar to normal municipal sewage,while C₅ and C₁₀ had the nutrients and heavy metals as five and ten times as those in C₁,respectively.The control was of 15‰ salinity.All the test wastewater was quantitatively irrigated weakly for a year.The results showed that the cadmium in the synthetic wastewater discharged into the system was mainly stagnated in soil subsystem (87.67%～96.74%),and only a small portion (0.43%～3.23%) migrated into plants and litters.After a year trial,the Cd content in roots was more than that in stems and leaves.The artificial Avicennia marina wetland system did have a significant effect on purifying cadmium in synthetic wastewater,and the purification rate for C₁,C₅ and C₁₀ was 90.43%,97.17% and 97.06%,respectively.

Key words: Avicennia marina, Artificial wetland system, Cadmium, Distribution, Migration, Purifying effect

CLC Number:

Q948.116

CHEN Guikui, CHEN Guizhu . Distribution,migration and purifying effect of cadmium in artificial Avicennia marina wetland system[J]. Chinese Journal of Applied Ecology, 2005, 16(3): 550-554.

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